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baherus [9]
3 years ago
12

Give an example of change that includes more than one change​

Chemistry
1 answer:
bogdanovich [222]3 years ago
6 0

Answer:

candle.

Explanation:

Candle has more than one change chemical and physical.

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Explanation:

Mass = moles x Molar mass

Mass = 4.50(187.55)

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Write the formula for each of the following compounds
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the formula is Mg(NO3)2

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What is the threshold frequency ν0 of cesium?
Montano1993 [528]
 I think this is what you're after:

 Cs(g) → Cs^+ + e⁻ ΔHIP = 375.7 kJ mol^-1 [1] 


Convert to J and divide by the Avogadro Const to give E in J per photon 


E = 375700/6.022×10^23 = 6.239×10^-19 J 


Plank relationship E = h×ν E in J ν = frequency (Hz s-1) 


Planck constant h = 6.626×10^-34 J s 


6.239×10^-19 = (6.626×10^-34)ν 


ν = 9.42×10^14 s^-1 (Hz) 


IP are usually given in ev Cs 3.894 eV 


<span>E = 3.894×1.60×10^-19 = 6.230×10^-19 J per photon </span>

4 0
3 years ago
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